ANDROID: sched: add trace hook to enable EAS for SMP systems

At present, EAS gets disabled when on ASYM Capacity systems
if all BIG or Little CPUs gets hot-plugged. Instead of disabling
EAS by default, add trace hook and let vendor decide if EAS should
be disabled or not.

Bug: 200103201
Change-Id: I583272cc89d44f3e3a4b1c43e3f75d731092ebf6
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>
Signed-off-by: Ashay Jaiswal <quic_ashayj@quicinc.com>